Commit | Line | Data |
---|---|---|
0d62e5e8 | 1 | /* Thread management interface, for the remote server for GDB. |
ecd75fc8 | 2 | Copyright (C) 2002-2014 Free Software Foundation, Inc. |
0d62e5e8 DJ |
3 | |
4 | Contributed by MontaVista Software. | |
5 | ||
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
0d62e5e8 DJ |
11 | (at your option) any later version. |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
0d62e5e8 DJ |
20 | |
21 | #include "server.h" | |
22 | ||
23 | #include "linux-low.h" | |
24 | ||
25 | extern int debug_threads; | |
26 | ||
24a09b5f DJ |
27 | static int thread_db_use_events; |
28 | ||
0050a760 | 29 | #include "gdb_proc_service.h" |
6938fd34 | 30 | #include "gdb_thread_db.h" |
e6712ff1 | 31 | #include "gdb_vecs.h" |
0d62e5e8 | 32 | |
96f15937 | 33 | #ifndef USE_LIBTHREAD_DB_DIRECTLY |
cdbfd419 | 34 | #include <dlfcn.h> |
96f15937 PP |
35 | #endif |
36 | ||
186947f7 | 37 | #include <stdint.h> |
cdbfd419 PP |
38 | #include <limits.h> |
39 | #include <ctype.h> | |
40 | ||
41 | struct thread_db | |
42 | { | |
43 | /* Structure that identifies the child process for the | |
44 | <proc_service.h> interface. */ | |
45 | struct ps_prochandle proc_handle; | |
46 | ||
47 | /* Connection to the libthread_db library. */ | |
48 | td_thragent_t *thread_agent; | |
49 | ||
9836d6ea PA |
50 | /* If this flag has been set, we've already asked GDB for all |
51 | symbols we might need; assume symbol cache misses are | |
52 | failures. */ | |
53 | int all_symbols_looked_up; | |
54 | ||
96f15937 | 55 | #ifndef USE_LIBTHREAD_DB_DIRECTLY |
cdbfd419 PP |
56 | /* Handle of the libthread_db from dlopen. */ |
57 | void *handle; | |
96f15937 | 58 | #endif |
cdbfd419 | 59 | |
f9e39928 PA |
60 | /* Thread creation event breakpoint. The code at this location in |
61 | the child process will be called by the pthread library whenever | |
62 | a new thread is created. By setting a special breakpoint at this | |
63 | location, GDB can detect when a new thread is created. We obtain | |
64 | this location via the td_ta_event_addr call. Note that if the | |
65 | running kernel supports tracing clones, then we don't need to use | |
66 | (and in fact don't use) this magic thread event breakpoint to | |
67 | learn about threads. */ | |
68 | struct breakpoint *td_create_bp; | |
69 | ||
cdbfd419 PP |
70 | /* Addresses of libthread_db functions. */ |
71 | td_err_e (*td_ta_new_p) (struct ps_prochandle * ps, td_thragent_t **ta); | |
72 | td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta, | |
73 | td_event_msg_t *msg); | |
74 | td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta, | |
75 | td_thr_events_t *event); | |
76 | td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta, | |
77 | td_event_e event, td_notify_t *ptr); | |
78 | td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta, lwpid_t lwpid, | |
79 | td_thrhandle_t *th); | |
80 | td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th, | |
81 | td_thrinfo_t *infop); | |
82 | td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th, int event); | |
83 | td_err_e (*td_ta_thr_iter_p) (const td_thragent_t *ta, | |
84 | td_thr_iter_f *callback, void *cbdata_p, | |
85 | td_thr_state_e state, int ti_pri, | |
86 | sigset_t *ti_sigmask_p, | |
87 | unsigned int ti_user_flags); | |
88 | td_err_e (*td_thr_tls_get_addr_p) (const td_thrhandle_t *th, | |
00f515da DE |
89 | psaddr_t map_address, |
90 | size_t offset, psaddr_t *address); | |
cdbfd419 PP |
91 | const char ** (*td_symbol_list_p) (void); |
92 | }; | |
93 | ||
94 | static char *libthread_db_search_path; | |
186947f7 | 95 | |
95954743 | 96 | static int find_one_thread (ptid_t); |
0d62e5e8 DJ |
97 | static int find_new_threads_callback (const td_thrhandle_t *th_p, void *data); |
98 | ||
54363045 | 99 | static const char * |
0d62e5e8 DJ |
100 | thread_db_err_str (td_err_e err) |
101 | { | |
102 | static char buf[64]; | |
103 | ||
104 | switch (err) | |
105 | { | |
106 | case TD_OK: | |
107 | return "generic 'call succeeded'"; | |
108 | case TD_ERR: | |
109 | return "generic error"; | |
110 | case TD_NOTHR: | |
111 | return "no thread to satisfy query"; | |
112 | case TD_NOSV: | |
113 | return "no sync handle to satisfy query"; | |
114 | case TD_NOLWP: | |
115 | return "no LWP to satisfy query"; | |
116 | case TD_BADPH: | |
117 | return "invalid process handle"; | |
118 | case TD_BADTH: | |
119 | return "invalid thread handle"; | |
120 | case TD_BADSH: | |
121 | return "invalid synchronization handle"; | |
122 | case TD_BADTA: | |
123 | return "invalid thread agent"; | |
124 | case TD_BADKEY: | |
125 | return "invalid key"; | |
126 | case TD_NOMSG: | |
127 | return "no event message for getmsg"; | |
128 | case TD_NOFPREGS: | |
129 | return "FPU register set not available"; | |
130 | case TD_NOLIBTHREAD: | |
131 | return "application not linked with libthread"; | |
132 | case TD_NOEVENT: | |
133 | return "requested event is not supported"; | |
134 | case TD_NOCAPAB: | |
135 | return "capability not available"; | |
136 | case TD_DBERR: | |
137 | return "debugger service failed"; | |
138 | case TD_NOAPLIC: | |
139 | return "operation not applicable to"; | |
140 | case TD_NOTSD: | |
141 | return "no thread-specific data for this thread"; | |
142 | case TD_MALLOC: | |
143 | return "malloc failed"; | |
144 | case TD_PARTIALREG: | |
145 | return "only part of register set was written/read"; | |
146 | case TD_NOXREGS: | |
147 | return "X register set not available for this thread"; | |
3db0444b DJ |
148 | #ifdef HAVE_TD_VERSION |
149 | case TD_VERSION: | |
150 | return "version mismatch between libthread_db and libpthread"; | |
151 | #endif | |
0d62e5e8 | 152 | default: |
6cebaf6e | 153 | xsnprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err); |
0d62e5e8 DJ |
154 | return buf; |
155 | } | |
156 | } | |
157 | ||
158 | #if 0 | |
159 | static char * | |
160 | thread_db_state_str (td_thr_state_e state) | |
161 | { | |
162 | static char buf[64]; | |
163 | ||
164 | switch (state) | |
165 | { | |
166 | case TD_THR_STOPPED: | |
167 | return "stopped by debugger"; | |
168 | case TD_THR_RUN: | |
169 | return "runnable"; | |
170 | case TD_THR_ACTIVE: | |
171 | return "active"; | |
172 | case TD_THR_ZOMBIE: | |
173 | return "zombie"; | |
174 | case TD_THR_SLEEP: | |
175 | return "sleeping"; | |
176 | case TD_THR_STOPPED_ASLEEP: | |
177 | return "stopped by debugger AND blocked"; | |
178 | default: | |
6cebaf6e | 179 | xsnprintf (buf, sizeof (buf), "unknown thread_db state %d", state); |
0d62e5e8 DJ |
180 | return buf; |
181 | } | |
182 | } | |
183 | #endif | |
184 | ||
b65d95c5 | 185 | static int |
0d62e5e8 DJ |
186 | thread_db_create_event (CORE_ADDR where) |
187 | { | |
188 | td_event_msg_t msg; | |
189 | td_err_e err; | |
54a0b537 | 190 | struct lwp_info *lwp; |
cdbfd419 PP |
191 | struct thread_db *thread_db = current_process ()->private->thread_db; |
192 | ||
193 | if (thread_db->td_ta_event_getmsg_p == NULL) | |
194 | fatal ("unexpected thread_db->td_ta_event_getmsg_p == NULL"); | |
0d62e5e8 DJ |
195 | |
196 | if (debug_threads) | |
87ce2a04 | 197 | debug_printf ("Thread creation event.\n"); |
0d62e5e8 | 198 | |
0d62e5e8 DJ |
199 | /* FIXME: This assumes we don't get another event. |
200 | In the LinuxThreads implementation, this is safe, | |
201 | because all events come from the manager thread | |
202 | (except for its own creation, of course). */ | |
cdbfd419 | 203 | err = thread_db->td_ta_event_getmsg_p (thread_db->thread_agent, &msg); |
0d62e5e8 DJ |
204 | if (err != TD_OK) |
205 | fprintf (stderr, "thread getmsg err: %s\n", | |
206 | thread_db_err_str (err)); | |
207 | ||
4105de34 DJ |
208 | /* If we do not know about the main thread yet, this would be a good time to |
209 | find it. We need to do this to pick up the main thread before any newly | |
210 | created threads. */ | |
54a0b537 PA |
211 | lwp = get_thread_lwp (current_inferior); |
212 | if (lwp->thread_known == 0) | |
80894984 | 213 | find_one_thread (current_inferior->entry.id); |
4105de34 | 214 | |
0d62e5e8 DJ |
215 | /* msg.event == TD_EVENT_CREATE */ |
216 | ||
217 | find_new_threads_callback (msg.th_p, NULL); | |
b65d95c5 DJ |
218 | |
219 | return 0; | |
0d62e5e8 DJ |
220 | } |
221 | ||
0d62e5e8 | 222 | static int |
f9e39928 | 223 | thread_db_enable_reporting (void) |
0d62e5e8 DJ |
224 | { |
225 | td_thr_events_t events; | |
226 | td_notify_t notify; | |
227 | td_err_e err; | |
cdbfd419 PP |
228 | struct thread_db *thread_db = current_process ()->private->thread_db; |
229 | ||
230 | if (thread_db->td_ta_set_event_p == NULL | |
231 | || thread_db->td_ta_event_addr_p == NULL | |
232 | || thread_db->td_ta_event_getmsg_p == NULL) | |
233 | /* This libthread_db is missing required support. */ | |
234 | return 0; | |
0d62e5e8 DJ |
235 | |
236 | /* Set the process wide mask saying which events we're interested in. */ | |
237 | td_event_emptyset (&events); | |
238 | td_event_addset (&events, TD_CREATE); | |
239 | ||
cdbfd419 | 240 | err = thread_db->td_ta_set_event_p (thread_db->thread_agent, &events); |
0d62e5e8 DJ |
241 | if (err != TD_OK) |
242 | { | |
243 | warning ("Unable to set global thread event mask: %s", | |
1b3f6016 | 244 | thread_db_err_str (err)); |
0d62e5e8 DJ |
245 | return 0; |
246 | } | |
247 | ||
248 | /* Get address for thread creation breakpoint. */ | |
cdbfd419 PP |
249 | err = thread_db->td_ta_event_addr_p (thread_db->thread_agent, TD_CREATE, |
250 | ¬ify); | |
0d62e5e8 DJ |
251 | if (err != TD_OK) |
252 | { | |
253 | warning ("Unable to get location for thread creation breakpoint: %s", | |
254 | thread_db_err_str (err)); | |
255 | return 0; | |
256 | } | |
f9e39928 PA |
257 | thread_db->td_create_bp |
258 | = set_breakpoint_at ((CORE_ADDR) (unsigned long) notify.u.bptaddr, | |
259 | thread_db_create_event); | |
0d62e5e8 | 260 | |
0d62e5e8 DJ |
261 | return 1; |
262 | } | |
263 | ||
ae13219e | 264 | static int |
95954743 | 265 | find_one_thread (ptid_t ptid) |
0d62e5e8 | 266 | { |
ae13219e DJ |
267 | td_thrhandle_t th; |
268 | td_thrinfo_t ti; | |
0d62e5e8 DJ |
269 | td_err_e err; |
270 | struct thread_info *inferior; | |
54a0b537 | 271 | struct lwp_info *lwp; |
cdbfd419 | 272 | struct thread_db *thread_db = current_process ()->private->thread_db; |
95954743 | 273 | int lwpid = ptid_get_lwp (ptid); |
0d62e5e8 | 274 | |
95954743 | 275 | inferior = (struct thread_info *) find_inferior_id (&all_threads, ptid); |
54a0b537 PA |
276 | lwp = get_thread_lwp (inferior); |
277 | if (lwp->thread_known) | |
ae13219e DJ |
278 | return 1; |
279 | ||
24a09b5f | 280 | /* Get information about this thread. */ |
cdbfd419 | 281 | err = thread_db->td_ta_map_lwp2thr_p (thread_db->thread_agent, lwpid, &th); |
ae13219e | 282 | if (err != TD_OK) |
24a09b5f DJ |
283 | error ("Cannot get thread handle for LWP %d: %s", |
284 | lwpid, thread_db_err_str (err)); | |
ae13219e | 285 | |
cdbfd419 | 286 | err = thread_db->td_thr_get_info_p (&th, &ti); |
ae13219e | 287 | if (err != TD_OK) |
24a09b5f DJ |
288 | error ("Cannot get thread info for LWP %d: %s", |
289 | lwpid, thread_db_err_str (err)); | |
ae13219e DJ |
290 | |
291 | if (debug_threads) | |
87ce2a04 DE |
292 | debug_printf ("Found thread %ld (LWP %d)\n", |
293 | ti.ti_tid, ti.ti_lid); | |
ae13219e | 294 | |
95954743 | 295 | if (lwpid != ti.ti_lid) |
24a09b5f DJ |
296 | { |
297 | warning ("PID mismatch! Expected %ld, got %ld", | |
95954743 | 298 | (long) lwpid, (long) ti.ti_lid); |
24a09b5f DJ |
299 | return 0; |
300 | } | |
ae13219e | 301 | |
24a09b5f | 302 | if (thread_db_use_events) |
0d62e5e8 | 303 | { |
cdbfd419 | 304 | err = thread_db->td_thr_event_enable_p (&th, 1); |
ae13219e DJ |
305 | if (err != TD_OK) |
306 | error ("Cannot enable thread event reporting for %d: %s", | |
307 | ti.ti_lid, thread_db_err_str (err)); | |
0d62e5e8 | 308 | } |
ae13219e | 309 | |
24a09b5f DJ |
310 | /* If the new thread ID is zero, a final thread ID will be available |
311 | later. Do not enable thread debugging yet. */ | |
312 | if (ti.ti_tid == 0) | |
313 | return 0; | |
ae13219e | 314 | |
54a0b537 PA |
315 | lwp->thread_known = 1; |
316 | lwp->th = th; | |
ae13219e | 317 | |
ae13219e DJ |
318 | return 1; |
319 | } | |
320 | ||
5f7d1694 PP |
321 | /* Attach a thread. Return true on success. */ |
322 | ||
323 | static int | |
324 | attach_thread (const td_thrhandle_t *th_p, td_thrinfo_t *ti_p) | |
ae13219e | 325 | { |
7ae1a6a6 PA |
326 | struct process_info *proc = current_process (); |
327 | int pid = pid_of (proc); | |
328 | ptid_t ptid = ptid_build (pid, ti_p->ti_lid, 0); | |
54a0b537 | 329 | struct lwp_info *lwp; |
7ae1a6a6 | 330 | int err; |
ae13219e | 331 | |
0d62e5e8 | 332 | if (debug_threads) |
87ce2a04 DE |
333 | debug_printf ("Attaching to thread %ld (LWP %d)\n", |
334 | ti_p->ti_tid, ti_p->ti_lid); | |
7ae1a6a6 PA |
335 | err = linux_attach_lwp (ptid); |
336 | if (err != 0) | |
0d62e5e8 | 337 | { |
7ae1a6a6 PA |
338 | warning ("Could not attach to thread %ld (LWP %d): %s\n", |
339 | ti_p->ti_tid, ti_p->ti_lid, | |
340 | linux_attach_fail_reason_string (ptid, err)); | |
5f7d1694 | 341 | return 0; |
0d62e5e8 DJ |
342 | } |
343 | ||
7ae1a6a6 PA |
344 | lwp = find_lwp_pid (ptid); |
345 | gdb_assert (lwp != NULL); | |
54a0b537 PA |
346 | lwp->thread_known = 1; |
347 | lwp->th = *th_p; | |
24a09b5f DJ |
348 | |
349 | if (thread_db_use_events) | |
350 | { | |
5f7d1694 | 351 | td_err_e err; |
7ae1a6a6 | 352 | struct thread_db *thread_db = proc->private->thread_db; |
5f7d1694 | 353 | |
cdbfd419 | 354 | err = thread_db->td_thr_event_enable_p (th_p, 1); |
24a09b5f DJ |
355 | if (err != TD_OK) |
356 | error ("Cannot enable thread event reporting for %d: %s", | |
357 | ti_p->ti_lid, thread_db_err_str (err)); | |
358 | } | |
5f7d1694 PP |
359 | |
360 | return 1; | |
361 | } | |
362 | ||
363 | /* Attach thread if we haven't seen it yet. | |
364 | Increment *COUNTER if we have attached a new thread. | |
365 | Return false on failure. */ | |
366 | ||
367 | static int | |
368 | maybe_attach_thread (const td_thrhandle_t *th_p, td_thrinfo_t *ti_p, | |
369 | int *counter) | |
370 | { | |
371 | struct lwp_info *lwp; | |
372 | ||
373 | lwp = find_lwp_pid (pid_to_ptid (ti_p->ti_lid)); | |
374 | if (lwp != NULL) | |
375 | return 1; | |
376 | ||
377 | if (!attach_thread (th_p, ti_p)) | |
378 | return 0; | |
379 | ||
380 | if (counter != NULL) | |
381 | *counter += 1; | |
382 | ||
383 | return 1; | |
0d62e5e8 DJ |
384 | } |
385 | ||
386 | static int | |
387 | find_new_threads_callback (const td_thrhandle_t *th_p, void *data) | |
388 | { | |
389 | td_thrinfo_t ti; | |
390 | td_err_e err; | |
cdbfd419 | 391 | struct thread_db *thread_db = current_process ()->private->thread_db; |
0d62e5e8 | 392 | |
cdbfd419 | 393 | err = thread_db->td_thr_get_info_p (th_p, &ti); |
0d62e5e8 DJ |
394 | if (err != TD_OK) |
395 | error ("Cannot get thread info: %s", thread_db_err_str (err)); | |
396 | ||
397 | /* Check for zombies. */ | |
398 | if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE) | |
399 | return 0; | |
400 | ||
5f7d1694 PP |
401 | if (!maybe_attach_thread (th_p, &ti, (int *) data)) |
402 | { | |
403 | /* Terminate iteration early: we might be looking at stale data in | |
404 | the inferior. The thread_db_find_new_threads will retry. */ | |
405 | return 1; | |
406 | } | |
0d62e5e8 DJ |
407 | |
408 | return 0; | |
409 | } | |
410 | ||
411 | static void | |
412 | thread_db_find_new_threads (void) | |
413 | { | |
414 | td_err_e err; | |
fbd5db48 | 415 | ptid_t ptid = current_ptid; |
cdbfd419 | 416 | struct thread_db *thread_db = current_process ()->private->thread_db; |
5f7d1694 | 417 | int loop, iteration; |
0d62e5e8 | 418 | |
ae13219e DJ |
419 | /* This function is only called when we first initialize thread_db. |
420 | First locate the initial thread. If it is not ready for | |
421 | debugging yet, then stop. */ | |
95954743 | 422 | if (find_one_thread (ptid) == 0) |
ae13219e DJ |
423 | return; |
424 | ||
5f7d1694 PP |
425 | /* Require 4 successive iterations which do not find any new threads. |
426 | The 4 is a heuristic: there is an inherent race here, and I have | |
427 | seen that 2 iterations in a row are not always sufficient to | |
428 | "capture" all threads. */ | |
429 | for (loop = 0, iteration = 0; loop < 4; ++loop, ++iteration) | |
430 | { | |
431 | int new_thread_count = 0; | |
432 | ||
433 | /* Iterate over all user-space threads to discover new threads. */ | |
434 | err = thread_db->td_ta_thr_iter_p (thread_db->thread_agent, | |
435 | find_new_threads_callback, | |
436 | &new_thread_count, | |
493e2a69 MS |
437 | TD_THR_ANY_STATE, |
438 | TD_THR_LOWEST_PRIORITY, | |
5f7d1694 PP |
439 | TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS); |
440 | if (debug_threads) | |
87ce2a04 DE |
441 | debug_printf ("Found %d threads in iteration %d.\n", |
442 | new_thread_count, iteration); | |
5f7d1694 PP |
443 | |
444 | if (new_thread_count != 0) | |
445 | { | |
446 | /* Found new threads. Restart iteration from beginning. */ | |
447 | loop = -1; | |
448 | } | |
449 | } | |
0d62e5e8 DJ |
450 | if (err != TD_OK) |
451 | error ("Cannot find new threads: %s", thread_db_err_str (err)); | |
452 | } | |
453 | ||
fd500816 DJ |
454 | /* Cache all future symbols that thread_db might request. We can not |
455 | request symbols at arbitrary states in the remote protocol, only | |
456 | when the client tells us that new symbols are available. So when | |
457 | we load the thread library, make sure to check the entire list. */ | |
458 | ||
459 | static void | |
460 | thread_db_look_up_symbols (void) | |
461 | { | |
cdbfd419 PP |
462 | struct thread_db *thread_db = current_process ()->private->thread_db; |
463 | const char **sym_list; | |
fd500816 DJ |
464 | CORE_ADDR unused; |
465 | ||
cdbfd419 | 466 | for (sym_list = thread_db->td_symbol_list_p (); *sym_list; sym_list++) |
9836d6ea PA |
467 | look_up_one_symbol (*sym_list, &unused, 1); |
468 | ||
469 | /* We're not interested in any other libraries loaded after this | |
470 | point, only in symbols in libpthread.so. */ | |
471 | thread_db->all_symbols_looked_up = 1; | |
472 | } | |
473 | ||
474 | int | |
475 | thread_db_look_up_one_symbol (const char *name, CORE_ADDR *addrp) | |
476 | { | |
477 | struct thread_db *thread_db = current_process ()->private->thread_db; | |
478 | int may_ask_gdb = !thread_db->all_symbols_looked_up; | |
479 | ||
480 | /* If we've passed the call to thread_db_look_up_symbols, then | |
481 | anything not in the cache must not exist; we're not interested | |
482 | in any libraries loaded after that point, only in symbols in | |
483 | libpthread.so. It might not be an appropriate time to look | |
484 | up a symbol, e.g. while we're trying to fetch registers. */ | |
485 | return look_up_one_symbol (name, addrp, may_ask_gdb); | |
fd500816 DJ |
486 | } |
487 | ||
dae5f5cf DJ |
488 | int |
489 | thread_db_get_tls_address (struct thread_info *thread, CORE_ADDR offset, | |
490 | CORE_ADDR load_module, CORE_ADDR *address) | |
491 | { | |
dae5f5cf DJ |
492 | psaddr_t addr; |
493 | td_err_e err; | |
54a0b537 | 494 | struct lwp_info *lwp; |
95954743 | 495 | struct thread_info *saved_inferior; |
cdbfd419 PP |
496 | struct process_info *proc; |
497 | struct thread_db *thread_db; | |
498 | ||
499 | proc = get_thread_process (thread); | |
500 | thread_db = proc->private->thread_db; | |
dae5f5cf | 501 | |
7fe519cb | 502 | /* If the thread layer is not (yet) initialized, fail. */ |
8a4ac37e | 503 | if (thread_db == NULL || !thread_db->all_symbols_looked_up) |
7fe519cb UW |
504 | return TD_ERR; |
505 | ||
cdbfd419 PP |
506 | if (thread_db->td_thr_tls_get_addr_p == NULL) |
507 | return -1; | |
508 | ||
54a0b537 PA |
509 | lwp = get_thread_lwp (thread); |
510 | if (!lwp->thread_known) | |
80894984 | 511 | find_one_thread (thread->entry.id); |
54a0b537 | 512 | if (!lwp->thread_known) |
dae5f5cf DJ |
513 | return TD_NOTHR; |
514 | ||
95954743 PA |
515 | saved_inferior = current_inferior; |
516 | current_inferior = thread; | |
186947f7 DJ |
517 | /* Note the cast through uintptr_t: this interface only works if |
518 | a target address fits in a psaddr_t, which is a host pointer. | |
519 | So a 32-bit debugger can not access 64-bit TLS through this. */ | |
cdbfd419 PP |
520 | err = thread_db->td_thr_tls_get_addr_p (&lwp->th, |
521 | (psaddr_t) (uintptr_t) load_module, | |
522 | offset, &addr); | |
95954743 | 523 | current_inferior = saved_inferior; |
dae5f5cf DJ |
524 | if (err == TD_OK) |
525 | { | |
186947f7 | 526 | *address = (CORE_ADDR) (uintptr_t) addr; |
dae5f5cf DJ |
527 | return 0; |
528 | } | |
529 | else | |
530 | return err; | |
cdbfd419 PP |
531 | } |
532 | ||
96f15937 PP |
533 | #ifdef USE_LIBTHREAD_DB_DIRECTLY |
534 | ||
535 | static int | |
536 | thread_db_load_search (void) | |
537 | { | |
538 | td_err_e err; | |
9836d6ea | 539 | struct thread_db *tdb; |
96f15937 PP |
540 | struct process_info *proc = current_process (); |
541 | ||
542 | if (proc->private->thread_db != NULL) | |
543 | fatal ("unexpected: proc->private->thread_db != NULL"); | |
544 | ||
9836d6ea PA |
545 | tdb = xcalloc (1, sizeof (*tdb)); |
546 | proc->private->thread_db = tdb; | |
f9e39928 | 547 | |
9836d6ea | 548 | tdb->td_ta_new_p = &td_ta_new; |
96f15937 PP |
549 | |
550 | /* Attempt to open a connection to the thread library. */ | |
9836d6ea | 551 | err = tdb->td_ta_new_p (&tdb->proc_handle, &tdb->thread_agent); |
96f15937 PP |
552 | if (err != TD_OK) |
553 | { | |
554 | if (debug_threads) | |
87ce2a04 | 555 | debug_printf ("td_ta_new(): %s\n", thread_db_err_str (err)); |
9836d6ea PA |
556 | free (tdb); |
557 | proc->private->thread_db = NULL; | |
96f15937 PP |
558 | return 0; |
559 | } | |
560 | ||
9836d6ea PA |
561 | tdb->td_ta_map_lwp2thr_p = &td_ta_map_lwp2thr; |
562 | tdb->td_thr_get_info_p = &td_thr_get_info; | |
563 | tdb->td_ta_thr_iter_p = &td_ta_thr_iter; | |
564 | tdb->td_symbol_list_p = &td_symbol_list; | |
96f15937 PP |
565 | |
566 | /* This is required only when thread_db_use_events is on. */ | |
9836d6ea | 567 | tdb->td_thr_event_enable_p = &td_thr_event_enable; |
96f15937 PP |
568 | |
569 | /* These are not essential. */ | |
9836d6ea PA |
570 | tdb->td_ta_event_addr_p = &td_ta_event_addr; |
571 | tdb->td_ta_set_event_p = &td_ta_set_event; | |
572 | tdb->td_ta_event_getmsg_p = &td_ta_event_getmsg; | |
573 | tdb->td_thr_tls_get_addr_p = &td_thr_tls_get_addr; | |
96f15937 PP |
574 | |
575 | return 1; | |
576 | } | |
577 | ||
578 | #else | |
579 | ||
cdbfd419 PP |
580 | static int |
581 | try_thread_db_load_1 (void *handle) | |
582 | { | |
583 | td_err_e err; | |
9836d6ea | 584 | struct thread_db *tdb; |
cdbfd419 PP |
585 | struct process_info *proc = current_process (); |
586 | ||
587 | if (proc->private->thread_db != NULL) | |
588 | fatal ("unexpected: proc->private->thread_db != NULL"); | |
589 | ||
9836d6ea PA |
590 | tdb = xcalloc (1, sizeof (*tdb)); |
591 | proc->private->thread_db = tdb; | |
f9e39928 | 592 | |
9836d6ea | 593 | tdb->handle = handle; |
cdbfd419 PP |
594 | |
595 | /* Initialize pointers to the dynamic library functions we will use. | |
596 | Essential functions first. */ | |
597 | ||
598 | #define CHK(required, a) \ | |
599 | do \ | |
600 | { \ | |
601 | if ((a) == NULL) \ | |
602 | { \ | |
603 | if (debug_threads) \ | |
87ce2a04 | 604 | debug_printf ("dlsym: %s\n", dlerror ()); \ |
cdbfd419 | 605 | if (required) \ |
9836d6ea PA |
606 | { \ |
607 | free (tdb); \ | |
608 | proc->private->thread_db = NULL; \ | |
609 | return 0; \ | |
610 | } \ | |
cdbfd419 PP |
611 | } \ |
612 | } \ | |
613 | while (0) | |
614 | ||
9836d6ea | 615 | CHK (1, tdb->td_ta_new_p = dlsym (handle, "td_ta_new")); |
cdbfd419 PP |
616 | |
617 | /* Attempt to open a connection to the thread library. */ | |
9836d6ea | 618 | err = tdb->td_ta_new_p (&tdb->proc_handle, &tdb->thread_agent); |
cdbfd419 PP |
619 | if (err != TD_OK) |
620 | { | |
621 | if (debug_threads) | |
87ce2a04 | 622 | debug_printf ("td_ta_new(): %s\n", thread_db_err_str (err)); |
9836d6ea PA |
623 | free (tdb); |
624 | proc->private->thread_db = NULL; | |
cdbfd419 PP |
625 | return 0; |
626 | } | |
627 | ||
9836d6ea PA |
628 | CHK (1, tdb->td_ta_map_lwp2thr_p = dlsym (handle, "td_ta_map_lwp2thr")); |
629 | CHK (1, tdb->td_thr_get_info_p = dlsym (handle, "td_thr_get_info")); | |
630 | CHK (1, tdb->td_ta_thr_iter_p = dlsym (handle, "td_ta_thr_iter")); | |
631 | CHK (1, tdb->td_symbol_list_p = dlsym (handle, "td_symbol_list")); | |
cdbfd419 PP |
632 | |
633 | /* This is required only when thread_db_use_events is on. */ | |
634 | CHK (thread_db_use_events, | |
9836d6ea | 635 | tdb->td_thr_event_enable_p = dlsym (handle, "td_thr_event_enable")); |
cdbfd419 PP |
636 | |
637 | /* These are not essential. */ | |
9836d6ea PA |
638 | CHK (0, tdb->td_ta_event_addr_p = dlsym (handle, "td_ta_event_addr")); |
639 | CHK (0, tdb->td_ta_set_event_p = dlsym (handle, "td_ta_set_event")); | |
640 | CHK (0, tdb->td_ta_event_getmsg_p = dlsym (handle, "td_ta_event_getmsg")); | |
641 | CHK (0, tdb->td_thr_tls_get_addr_p = dlsym (handle, "td_thr_tls_get_addr")); | |
cdbfd419 PP |
642 | |
643 | #undef CHK | |
644 | ||
cdbfd419 PP |
645 | return 1; |
646 | } | |
647 | ||
10e86dd7 DE |
648 | #ifdef HAVE_DLADDR |
649 | ||
cdbfd419 PP |
650 | /* Lookup a library in which given symbol resides. |
651 | Note: this is looking in the GDBSERVER process, not in the inferior. | |
652 | Returns library name, or NULL. */ | |
653 | ||
654 | static const char * | |
655 | dladdr_to_soname (const void *addr) | |
656 | { | |
657 | Dl_info info; | |
658 | ||
659 | if (dladdr (addr, &info) != 0) | |
660 | return info.dli_fname; | |
661 | return NULL; | |
662 | } | |
663 | ||
10e86dd7 DE |
664 | #endif |
665 | ||
cdbfd419 PP |
666 | static int |
667 | try_thread_db_load (const char *library) | |
668 | { | |
669 | void *handle; | |
670 | ||
671 | if (debug_threads) | |
87ce2a04 DE |
672 | debug_printf ("Trying host libthread_db library: %s.\n", |
673 | library); | |
cdbfd419 PP |
674 | handle = dlopen (library, RTLD_NOW); |
675 | if (handle == NULL) | |
676 | { | |
677 | if (debug_threads) | |
87ce2a04 | 678 | debug_printf ("dlopen failed: %s.\n", dlerror ()); |
cdbfd419 PP |
679 | return 0; |
680 | } | |
681 | ||
10e86dd7 | 682 | #ifdef HAVE_DLADDR |
cdbfd419 PP |
683 | if (debug_threads && strchr (library, '/') == NULL) |
684 | { | |
685 | void *td_init; | |
686 | ||
687 | td_init = dlsym (handle, "td_init"); | |
688 | if (td_init != NULL) | |
689 | { | |
690 | const char *const libpath = dladdr_to_soname (td_init); | |
691 | ||
692 | if (libpath != NULL) | |
693 | fprintf (stderr, "Host %s resolved to: %s.\n", | |
694 | library, libpath); | |
695 | } | |
696 | } | |
10e86dd7 | 697 | #endif |
cdbfd419 PP |
698 | |
699 | if (try_thread_db_load_1 (handle)) | |
700 | return 1; | |
701 | ||
702 | /* This library "refused" to work on current inferior. */ | |
703 | dlclose (handle); | |
704 | return 0; | |
705 | } | |
706 | ||
98a5dd13 DE |
707 | /* Handle $sdir in libthread-db-search-path. |
708 | Look for libthread_db in the system dirs, or wherever a plain | |
709 | dlopen(file_without_path) will look. | |
710 | The result is true for success. */ | |
711 | ||
cdbfd419 | 712 | static int |
98a5dd13 DE |
713 | try_thread_db_load_from_sdir (void) |
714 | { | |
715 | return try_thread_db_load (LIBTHREAD_DB_SO); | |
716 | } | |
717 | ||
718 | /* Try to load libthread_db from directory DIR of length DIR_LEN. | |
719 | The result is true for success. */ | |
720 | ||
721 | static int | |
722 | try_thread_db_load_from_dir (const char *dir, size_t dir_len) | |
cdbfd419 PP |
723 | { |
724 | char path[PATH_MAX]; | |
98a5dd13 DE |
725 | |
726 | if (dir_len + 1 + strlen (LIBTHREAD_DB_SO) + 1 > sizeof (path)) | |
727 | { | |
728 | char *cp = xmalloc (dir_len + 1); | |
729 | ||
730 | memcpy (cp, dir, dir_len); | |
731 | cp[dir_len] = '\0'; | |
732 | warning (_("libthread-db-search-path component too long," | |
733 | " ignored: %s."), cp); | |
734 | free (cp); | |
735 | return 0; | |
736 | } | |
737 | ||
738 | memcpy (path, dir, dir_len); | |
739 | path[dir_len] = '/'; | |
740 | strcpy (path + dir_len + 1, LIBTHREAD_DB_SO); | |
741 | return try_thread_db_load (path); | |
742 | } | |
743 | ||
744 | /* Search libthread_db_search_path for libthread_db which "agrees" | |
745 | to work on current inferior. | |
746 | The result is true for success. */ | |
747 | ||
748 | static int | |
749 | thread_db_load_search (void) | |
750 | { | |
e6712ff1 DE |
751 | VEC (char_ptr) *dir_vec; |
752 | char *this_dir; | |
753 | int i, rc = 0; | |
cdbfd419 PP |
754 | |
755 | if (libthread_db_search_path == NULL) | |
756 | libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH); | |
757 | ||
e6712ff1 DE |
758 | dir_vec = dirnames_to_char_ptr_vec (libthread_db_search_path); |
759 | ||
760 | for (i = 0; VEC_iterate (char_ptr, dir_vec, i, this_dir); ++i) | |
cdbfd419 | 761 | { |
e6712ff1 | 762 | const int pdir_len = sizeof ("$pdir") - 1; |
98a5dd13 DE |
763 | size_t this_dir_len; |
764 | ||
e6712ff1 | 765 | this_dir_len = strlen (this_dir); |
cdbfd419 | 766 | |
e6712ff1 DE |
767 | if (strncmp (this_dir, "$pdir", pdir_len) == 0 |
768 | && (this_dir[pdir_len] == '\0' | |
769 | || this_dir[pdir_len] == '/')) | |
98a5dd13 DE |
770 | { |
771 | /* We don't maintain a list of loaded libraries so we don't know | |
772 | where libpthread lives. We *could* fetch the info, but we don't | |
773 | do that yet. Ignore it. */ | |
774 | } | |
e6712ff1 | 775 | else if (strcmp (this_dir, "$sdir") == 0) |
98a5dd13 DE |
776 | { |
777 | if (try_thread_db_load_from_sdir ()) | |
cdbfd419 | 778 | { |
98a5dd13 | 779 | rc = 1; |
cdbfd419 PP |
780 | break; |
781 | } | |
cdbfd419 | 782 | } |
98a5dd13 | 783 | else |
cdbfd419 | 784 | { |
98a5dd13 DE |
785 | if (try_thread_db_load_from_dir (this_dir, this_dir_len)) |
786 | { | |
787 | rc = 1; | |
788 | break; | |
789 | } | |
cdbfd419 PP |
790 | } |
791 | } | |
cdbfd419 | 792 | |
e6712ff1 | 793 | free_char_ptr_vec (dir_vec); |
cdbfd419 | 794 | if (debug_threads) |
87ce2a04 | 795 | debug_printf ("thread_db_load_search returning %d\n", rc); |
cdbfd419 | 796 | return rc; |
dae5f5cf DJ |
797 | } |
798 | ||
96f15937 PP |
799 | #endif /* USE_LIBTHREAD_DB_DIRECTLY */ |
800 | ||
0d62e5e8 | 801 | int |
24a09b5f | 802 | thread_db_init (int use_events) |
0d62e5e8 | 803 | { |
95954743 | 804 | struct process_info *proc = current_process (); |
0d62e5e8 | 805 | |
fd500816 DJ |
806 | /* FIXME drow/2004-10-16: This is the "overall process ID", which |
807 | GNU/Linux calls tgid, "thread group ID". When we support | |
808 | attaching to threads, the original thread may not be the correct | |
809 | thread. We would have to get the process ID from /proc for NPTL. | |
810 | For LinuxThreads we could do something similar: follow the chain | |
811 | of parent processes until we find the highest one we're attached | |
812 | to, and use its tgid. | |
813 | ||
814 | This isn't the only place in gdbserver that assumes that the first | |
815 | process in the list is the thread group leader. */ | |
ea025f5f | 816 | |
24a09b5f DJ |
817 | thread_db_use_events = use_events; |
818 | ||
cdbfd419 | 819 | if (thread_db_load_search ()) |
0d62e5e8 | 820 | { |
24a09b5f | 821 | if (use_events && thread_db_enable_reporting () == 0) |
cdbfd419 PP |
822 | { |
823 | /* Keep trying; maybe event reporting will work later. */ | |
8336d594 | 824 | thread_db_mourn (proc); |
cdbfd419 PP |
825 | return 0; |
826 | } | |
0d62e5e8 | 827 | thread_db_find_new_threads (); |
fd500816 | 828 | thread_db_look_up_symbols (); |
0d62e5e8 | 829 | return 1; |
cdbfd419 | 830 | } |
0d62e5e8 | 831 | |
cdbfd419 PP |
832 | return 0; |
833 | } | |
834 | ||
ca5c370d PA |
835 | static int |
836 | any_thread_of (struct inferior_list_entry *entry, void *args) | |
837 | { | |
838 | int *pid_p = args; | |
839 | ||
840 | if (ptid_get_pid (entry->id) == *pid_p) | |
841 | return 1; | |
842 | ||
843 | return 0; | |
844 | } | |
845 | ||
f9e39928 PA |
846 | static void |
847 | switch_to_process (struct process_info *proc) | |
848 | { | |
849 | int pid = pid_of (proc); | |
850 | ||
851 | current_inferior = | |
852 | (struct thread_info *) find_inferior (&all_threads, | |
853 | any_thread_of, &pid); | |
854 | } | |
855 | ||
cdbfd419 PP |
856 | /* Disconnect from libthread_db and free resources. */ |
857 | ||
8336d594 PA |
858 | static void |
859 | disable_thread_event_reporting (struct process_info *proc) | |
cdbfd419 PP |
860 | { |
861 | struct thread_db *thread_db = proc->private->thread_db; | |
862 | if (thread_db) | |
863 | { | |
21e1bee4 PP |
864 | td_err_e (*td_ta_clear_event_p) (const td_thragent_t *ta, |
865 | td_thr_events_t *event); | |
866 | ||
fd7dd3e6 | 867 | #ifndef USE_LIBTHREAD_DB_DIRECTLY |
21e1bee4 | 868 | td_ta_clear_event_p = dlsym (thread_db->handle, "td_ta_clear_event"); |
fd7dd3e6 | 869 | #else |
fd7dd3e6 PA |
870 | td_ta_clear_event_p = &td_ta_clear_event; |
871 | #endif | |
872 | ||
8336d594 | 873 | if (td_ta_clear_event_p != NULL) |
21e1bee4 | 874 | { |
f9e39928 | 875 | struct thread_info *saved_inferior = current_inferior; |
21e1bee4 | 876 | td_thr_events_t events; |
8336d594 | 877 | |
f9e39928 | 878 | switch_to_process (proc); |
21e1bee4 | 879 | |
fd7dd3e6 PA |
880 | /* Set the process wide mask saying we aren't interested |
881 | in any events anymore. */ | |
21e1bee4 PP |
882 | td_event_fillset (&events); |
883 | (*td_ta_clear_event_p) (thread_db->thread_agent, &events); | |
8336d594 PA |
884 | |
885 | current_inferior = saved_inferior; | |
21e1bee4 | 886 | } |
8336d594 PA |
887 | } |
888 | } | |
889 | ||
f9e39928 PA |
890 | static void |
891 | remove_thread_event_breakpoints (struct process_info *proc) | |
892 | { | |
893 | struct thread_db *thread_db = proc->private->thread_db; | |
894 | ||
895 | if (thread_db->td_create_bp != NULL) | |
896 | { | |
897 | struct thread_info *saved_inferior = current_inferior; | |
898 | ||
899 | switch_to_process (proc); | |
900 | ||
901 | delete_breakpoint (thread_db->td_create_bp); | |
902 | thread_db->td_create_bp = NULL; | |
903 | ||
904 | current_inferior = saved_inferior; | |
905 | } | |
906 | } | |
907 | ||
8336d594 PA |
908 | void |
909 | thread_db_detach (struct process_info *proc) | |
910 | { | |
f9e39928 PA |
911 | struct thread_db *thread_db = proc->private->thread_db; |
912 | ||
913 | if (thread_db) | |
914 | { | |
915 | disable_thread_event_reporting (proc); | |
916 | remove_thread_event_breakpoints (proc); | |
917 | } | |
8336d594 PA |
918 | } |
919 | ||
920 | /* Disconnect from libthread_db and free resources. */ | |
921 | ||
922 | void | |
923 | thread_db_mourn (struct process_info *proc) | |
924 | { | |
925 | struct thread_db *thread_db = proc->private->thread_db; | |
926 | if (thread_db) | |
927 | { | |
928 | td_err_e (*td_ta_delete_p) (td_thragent_t *); | |
929 | ||
930 | #ifndef USE_LIBTHREAD_DB_DIRECTLY | |
931 | td_ta_delete_p = dlsym (thread_db->handle, "td_ta_delete"); | |
932 | #else | |
933 | td_ta_delete_p = &td_ta_delete; | |
934 | #endif | |
cdbfd419 | 935 | |
cdbfd419 PP |
936 | if (td_ta_delete_p != NULL) |
937 | (*td_ta_delete_p) (thread_db->thread_agent); | |
938 | ||
fd7dd3e6 | 939 | #ifndef USE_LIBTHREAD_DB_DIRECTLY |
cdbfd419 | 940 | dlclose (thread_db->handle); |
96f15937 PP |
941 | #endif /* USE_LIBTHREAD_DB_DIRECTLY */ |
942 | ||
cdbfd419 PP |
943 | free (thread_db); |
944 | proc->private->thread_db = NULL; | |
945 | } | |
946 | } | |
947 | ||
948 | /* Handle "set libthread-db-search-path" monitor command and return 1. | |
949 | For any other command, return 0. */ | |
950 | ||
951 | int | |
952 | thread_db_handle_monitor_command (char *mon) | |
953 | { | |
84e578fb DE |
954 | const char *cmd = "set libthread-db-search-path"; |
955 | size_t cmd_len = strlen (cmd); | |
956 | ||
957 | if (strncmp (mon, cmd, cmd_len) == 0 | |
958 | && (mon[cmd_len] == '\0' | |
959 | || mon[cmd_len] == ' ')) | |
cdbfd419 | 960 | { |
84e578fb | 961 | const char *cp = mon + cmd_len; |
cdbfd419 PP |
962 | |
963 | if (libthread_db_search_path != NULL) | |
964 | free (libthread_db_search_path); | |
965 | ||
966 | /* Skip leading space (if any). */ | |
967 | while (isspace (*cp)) | |
968 | ++cp; | |
969 | ||
84e578fb DE |
970 | if (*cp == '\0') |
971 | cp = LIBTHREAD_DB_SEARCH_PATH; | |
cdbfd419 PP |
972 | libthread_db_search_path = xstrdup (cp); |
973 | ||
974 | monitor_output ("libthread-db-search-path set to `"); | |
975 | monitor_output (libthread_db_search_path); | |
976 | monitor_output ("'\n"); | |
977 | return 1; | |
0d62e5e8 DJ |
978 | } |
979 | ||
cdbfd419 | 980 | /* Tell server.c to perform default processing. */ |
0d62e5e8 DJ |
981 | return 0; |
982 | } |